[border-agent] check if TLV is valid after reading (#3424)
[border-agent] check if TLV is valid after reading (#3424)


lanyuwen/openthread,lanyuwen/openthread,jwhui/openthread,srickardti/openthread,librasungirl/openthread,bukepo/openthread,jwhui/openthread,srickardti/openthread,jwhui/openthread,chshu/openthread,lanyuwen/openthread,openthread/openthread,librasungirl/openthread,srickardti/openthread,chshu/openthread,openthread/openthread,openthread/openthread,erja-gp/openthread,chshu/openthread,chshu/openthread,chshu/openthread,openthread/openthread,turon/openthread,erja-gp/openthread,jwhui/openthread,srickardti/openthread,lanyuwen/openthread,abtink/openthread,turon/openthread,erja-gp/openthread,bukepo/openthread,lanyuwen/openthread,chshu/openthread,lanyuwen/openthread,librasungirl/openthread,abtink/openthread,turon/openthread,erja-gp/openthread,abtink/openthread,erja-gp/openthread,erja-gp/openthread,librasungirl/openthread,abtink/openthread,bukepo/openthread,turon/openthread,bukepo/openthread